21144102445 has 8 divisors (see below), whose sum is σ = 25379051544. Its totient is φ = 16911196224.

The previous prime is 21144102439. The next prime is 21144102457. The reversal of 21144102445 is 54420144112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5251466089 + 15892636356 = 72467^2 + 126066^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21144102445 - 2⁹ = 21144101933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487854 + ... + 529423.

It is an arithmetic number, because the mean of its divisors is an integer number (3172381443).

Almost surely, 2^21144102445 is an apocalyptic number.

It is an amenable number.

21144102445 is a deficient number, since it is larger than the sum of its proper divisors (4234949099).

21144102445 is a wasteful number, since it uses less digits than its factorization.

21144102445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021439.

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 21144102445 its reverse (54420144112), we get a palindrome (75564246557).

The spelling of 21144102445 in words is "twenty-one billion, one hundred forty-four million, one hundred two thousand, four hundred forty-five".